Apparatus for washing coal, coke, &amp;c.



Patan'ted May 27, 1902.

c. BURNETT. APPARATUS FOR WASHING COAL, COKE, 81.0.

(Application filed Apr. 18, 1901.)

6 Sheets-Sheet I.

(No Model.)

nu: norms mans cc: M a-mug. w sumawu ug N0. 700, 735. Patented ma 27-, 1902'.

C. BURNETT.

APPARATUS FOR WASHING GOAL, COKE, &c.

' (Application filed. Apr. 16, 1901.

(No Model.)

' 'ruz'ummgs PETERS w, Puma-uric, wAsmrisTou, we;

No. 700,735. Patented May 27, |902.

c. BURNETT. I

APPARATUS FOR WASHING COAL, COKE, 8w.

(Ap plicatidn filed Apr. 18, 1901.

6 Sheets-Sheet 3.

(No Model.)

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No.-700,735. Patented May 27,1902! 0. BURNETT.

APPARATUS FDR WASHINGUUAL, COKE, 8L0.

(Applicationflled Apr. 18, 1901.)

6 Sheets-Sheet- 4.

(No Model.)

Tn: rgomys mini 90 mum. wunmumniu't.

Patented May 27, I902.

c. BURNETT. APPARATUS'FOB WASHING COAL, GOKE,'&0.

(Application flied'A pr. 1a, 1901.

6 Sheets-Sheet 5.

(No Model.)

I Pjate nted May 27, I902.

C. BURNETT. APPARATUS FOR WASHING COAL, COKE, &c.

(Application filed Apr. 18, 1901.) (No Model.) J

6 Sheets8heet 6,

FIG.

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UNITED STATES PATENT OFFICE.

CUTHBERT BURNETT, OF GRANGE, NEAR DURHAM, ENGLAND.

APPARATUS FOR WASHING COAL, COKE, 80G.

SPECIFICATION forming part of Letters Patent N 0. 700,735, dated May 27, 1902.

Application filed April 18, 1901. Serial No. 56,432. (No model.)

To all w/wm it may concern:

Be it known that I, CUTHBERT BURNETT, engineer, a subject of the King of Great Britain, residing at Grange, near Durham, in the county of Durham, England, have invented new and useful Improvements in Apparatus for Washing Coal, Coke, or other Minerals, Specially Applicable for Treating Slack or Small Coal for Coking, of which the following is a specification.

In coal washing apparatus in which the dirt or heavy particles are discharged at the higher end of a washing-troughsuch, for instance, as a fixed trough with an endless belt provided with scrapers, said belt moving in a slanting upward direction or a troughshaped" endless belt provided with dams and also moving in a slanting upward directionit has been found that there is a tendency for the washed coal to contain a notable proportion of pyrites or other heavy impurities and also that the washing-water while being circulated in the washing apparatus contains in suspension a considerable proportion of fine pyrites or other heavy impurities, or that special means, such as a sand-recovery trough, is sometimes employed for removing the said impurities. A further difficulty, more especially met with in washing what is called slack or fine coal, is that the e'lfluent water still contains in suspension a material proportion of fine coal, so that the well soon becomes silted up therewith unless a settling tank or pond is provided with or without special means for removing or elevating the silt.

Now the object of my invention is to secure perfect washing of the coal in a simple and efficient manner and by the employment of a simple and easily-controlled automaticallyacting plant.

Figures 1 and 1 together show in side ele-- show in side elevation, partly in section, a coal-washing apparatus embodying modifications, and in said views I have shown the 10- Fig.-

cation of the rakes. Fig. 5 is across-section of the upper web of belt and the trough wherein it works; and Fig. 6, a longitudinal section through part of the upper web. Fig. 7 is a detail view of bottom and of the washed-coal elevator. Fig. 8 shows a preferred form of slurry-elevator, and Fig. 9 is a cross-section of same on a larger scale. Fig. 10 is a detail side View of the automatic rakes and gear for able construction and with the upward slope toward the delivery end for the pyrites or other heavy impurities while the other endis used for the delivery of the washed coal is according to my invention at or near that end formed with a dip, as at A, or the belt may have more than one such dip at or near that end. In Fig. 1 the dip is, as an example, shown quite near that end and the end slope somewhat steeper than at the opposite end of the belt. gon pulleys and actuated in the usual manner, is moved continuously in a trough G (shown to a larger scale in Figs. 2 and 3) toward the other or higher end, from right to left in Fig. 1, as indicated by the arrow. The belt is near that higher end supplied with coal to be washed from a hopper B in quantities regulated by a slide B, link B and regulating hand-lever B N is an elevator for supplying the hopper with coal. The washing-water is supplied from a tank O partly by a pipe 0, regulat ing-cock G nozzle 0 and small trough or feed plates C" and partly by a pipe 0 regulating-cock O and nozzle 0 The water thus supplied washes the coal and floats it down to the aforesaid dip at A, where the water will be comparatively at rest, so that a considerable proportion of the fine coal previously held in suspension will deposit in the said dip, and as this takes place constantly, while the large coal also accumulates there, a perfect admixture of the small and the large coal takes place in the dip. This washed coal is removed from the dip preferably by The belt A, mounted on hexaan elevator D, withiperforated buckets for draining off thewater, or byv any other suitable lifting appliance which will allow any little water to drain back into the dip A. The elevator D conveys the coal to a hopper E or other receptacle or direct into a truck F, as local circumstances may require it. The bulk of the water flows off from the dip A over a suitable weir, weirs, or strainers such, for instance, as the gauze-covered overflow-openings h-into a gutter H at each side and thence by pipe H to a well or cistern I, from whence the sedimentary part of the water containing some finev coal, technically known as slurry, is raised, by preference, by an elevator K in order to be discharged onto the belt A for being rewashed. The comparatively clear water above the foot of the elevator is raised by a centrifugal pump L or other pump or means for delivery back to-the supply-cistern O in order to be circulated again over the washing-belt A. The

. great advantage of employing an elevator K is that the slurry, which may contain some heavyimpurities that have been carried along with the efiluent water along with they fine coal, will be raised in order to be further washed. This process of washing the coal in the proper manner is secured by-a suitable rate of coal-supply and bya-proper adjustment of the lower end of the elevator D in the dip A, so that the latter carries away the maximum quantity of clean washed coal, .The means of adjustment are shown in Fig. 1 and more clearly in the detail View, Fig. 7, where the bearings D of the bucketchain spindle are adjustable as to height in quadrants D by means of rods D and screw and provided with scrapers A on the under or inner side for removing what little fine stuif may have passed through the joints of the belt and have deposited on the floor of the trough G, or they may be, as shown in Fig. 3, on every other link of the belt A. This deposit is thus continuously carried to the aforesaid well or cistern 1, whence it is raised as part of the slurry by the aforesaid elevator K at that place, so. that it may be rewashed.

M is a dirt-hopper, and M is a dirt-conveyer, which latter, however, is not necessary unless the apparatus is arranged at a low level, as shown in Fig. 1.

Instead of using a bucket-chain elevator, as K, for raising the slurry I may advantageously employ an elevator of the form shown in Figs. 8 and 9, where dams K take the place of the buckets, and these dams are automatically cleanedby the scraper K on the weighted bell-crank lever K The dams K fit the inside of the elevator pretty closely, as will be seen in Fig. 9, but nevertheles permit the. water to drain o-fi.

In connection with the coal-washing apparatus I prefer to use automatic rakes for raking the coal as it is delivered onto the belt A from the hopper B and also for raking the dirt as the latter is carried up to the highest left-hand end of the endless belt A.

I will now describe the construction and arrangement of the coal-raking appliances, referring more particularly to Figs. 4, 4, 5, and 6, and to Figs. 10, 11, and 13.

In the,apparatus,-Figs. 4, 4 5, and 6, is

shown an endless belt A,- mounted on two chains A and having upright sides A which,

as seen iniFig. 6, are in parts overlapping each other in order that the belt may takea curved direction when passing over the hexagon end pulleys and when passing the depressed part of the flow of the trough G at the place of the dip A. In this case I have shown twowells I and N, both near the washed-coal-delivery end. This end is sufficientlylow to allow the water to pass over the end of the belt and thence through a spout from the trough G into the well I, where the-slurry will settle somewhat and is raised bythe elevator K and thence discharged on to the belt Ato be again washed and finally to be discharged into the coal-hopper E by the elevator D, as in Fig. l. The well I has, however, an overflowpassage I for the comparatively clean water to a well N. l The water in the latteris-bya centrifugal pump L or other pump and by the pipe L conveyed to the water-tank G. "In

this arrangement the apparatusis elevatedsufficiently high to dispense with the dirtconveyer. M, that was shown in Fig. l, and the dirt is delivered direct into the dirt-hopper M and thence into the truck. 0 is the overflow-pipe from the water-tank O to the pumpwell M. P is a pit containing coal to be washed, and N ran elevator for raising the coal to the coal-hopper B. U-is a gutter for receiving any water that may overflow from the bottom of the trough G andwhich by the pipe U runs into the settling-well I. At the higher left end of the washing-belt A, Figs.

1 and 4;, is shown the arrangement of two sets of the automatic rakes referred to, and in Figs. 10 to 13 they are shown more clearly and drawn to a larger scale and in conjunction with meansfor intermittently opening the gate or slide, whereby coal isadmitted to the washing-belt from the dry-coal hopper B.

The rakes are disposed in two sets, one set Q to the right of the coal-hopper B and one set Q between the water-nozzles O and 0 The rakes Q are mounted on a shaft R, which by a lever B, fixed on a spindle R and by rod R jointed to the lever, B, receives reciprocating motion in the axial direction from an eccentric R on a rotating spindle R The other set of rakes Q are mounted on a shaft S, which receives reciprocating motion in the axial direction by rod S from a lever S on the aforesaid reciprocated shaft R By means of the double set of rakes the coal on the belt A is subjected to a very effectual raking or overturning action, which tends to separate the pyrites or other heavy or extraneous materials therefrom, the material being subject at the same time to the powerful action of the water from the nozzles (J and G On the spindle R is fixed a disk T, Fig. 13, provided with a slotcrank or slot T, to which is adjustablyjointed a rod T". This rod is jointed to one end of a double-armed lever T its other end being connected to a slide B at the exit end of the chute from the dry-coal hopper B. This slide thus obtains a reciprocating up-and-down motion and admits coal to the small trough or feed plate (3, from whence the coal, aided by the jet from the Water-nozzle 0 drops onto the washing-belt A.

YVhat I claim as my invention, and desire to secure by Letters Patent, is- J 1. In a coal-washingapparatusin which the heavy impurities or dirt are discharged at the higherend of the slope of a sloping endless beltmovingtoward that endwhile the Washed coal is floated down toward the other end, a dip in said belt near the last-named end for causing the washing-waterto be there comparatively at rest, in order that the fine parts of the washed coal held in suspension, may deposit there in combination with means for raising the washed coal from such dip, substantially as set forth.

2. In a coal-washing apparatusin which the dirt or heavy impurities are discharged at the upper end of a sloping endless belt, having motion toward said end, a trough in which said belt travels, means for washing the coal and floating the washed coal down the slope of the belt, a dip in said belt at or near the lower end of its slope, and means for raising the washed coal from said dip, substantially as and for the purpose set forth.

In a coal-washing apparatus, the combination of a sloping endless belt, a trough in which said belt has motion toward the higher end of the slope, scrapers on the inner or under side of the belt for scraping said trough, means near the higher end of the slope of the belt for supplying coal and water thereto in regulated quantities, and a receptacle at said higher end of the belt for receiving the impurities, substantially as setforth.

4. In a coal-washingapparatus the combination of a sloping endless belt moving toward the higher end of the slope means near that end for supplying coal-and water in regulated quantities to the upper web of the belt, a set of transversely-reciprocated rakes at the coal-supply exit and another set of such rakes between such exit and the watersupply exit substantially as and for the purpose set forth.

5. In a coal-washing apparatus the combination of a sloping endless belt movingtoward the higher end of the slope, a dry-coalsupply hopper, near that end with means for regulating the delivery ofcoal therefrom a feed-plate or trough receiving the coal from the coal-hopper, a water-supply tank nearer that end, a pipe therefrom with regulatingcock and exit-nozzle which discharges Washing-water onto the coal in said feed-trough, another pipe from said supply-tank with regulating-cockand exit-nozzle which discharges washing-water onto the belt nearer the watertank, a set of transverse]y-reciprocated rakes at the coal-supply exit and another set of such rakes between the two water-supply exits, substantially as and for the purpose set forth.

6. In a coal-washing apparatus the combi-' nation of a sloping endless belt moving toward the higher end of the slope,'means substantially as described near that end for supplying coal and water in regulated quantities to the upper web of the belt, a dip in the belt at the other end of the belt, a trough at said dip; a settlingwell for receiving from the lower end of the slope of the bolt the over flowwater with matter suspended therein, an elevatorfor raising the slurry therefrom and deliveringit onto the belt for being rewashed, a pump -well receiving the overflow water from the settling-well, a pump to convey the water therein to the water-supply tank, and an overflow-pipe from the latter to the pumpwell substantially as set forth.

7. In a coal-washing apparatus, the combination of the slopingendless belt moving toward the higher end of the slope, means for delivering coal to said belt near'the said higher end of the slope, means for supplying water to the belt and floating the coal down'the slope, an elevator near the bottom of said slope for raising the washed coal from the belt, said elevator having a hinged bottom riding on said belt and a settling-well for receiving from the lower end of the slope the overflow-water and matter held in suspension therein, substantially as andfor the purpose set forth.

8. In a coal-washing apparatus, a sloping endless belt having motion toward the higher end of the slope, means for feeding the coal to be washed to said belt at or near said higher end, a dip in the belt near the lower end of the slope causing the wash-water to be there comparatively at rest; in combination with an elevator for raising the washed coal from said dip, and means for adjusting the intake of the elevator relatively to the dip, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this'specification in the presence of two subscribing witnesses.

CUTHBERT BURNETT.

Witnesses: v

CHAS. W. P. BARKER, JOHN A. FENTON. 

